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(ModeL) W. I. ALVORD.

KNOB ATTACHMENT.

No. 347,413. Patented Aug. 17, 1886.

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UNITED STATES PATENT OFFICE.

VlgILLlSTQN I. ALVORD, OF BRIDGEPORT, CONNECTICUT.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 347,413, dated August 17-, 1886.

Application filed January 2, 1836. Serial No. 187,331.

- To all whom it may concern:

Be it known that I, WILLISTON I. ALVORD, a citizen of the United States, residing at Bridgeport, in the county of. Fairfield and State of Connecticut, have invented certain new and useful Improvements in Knob Attachments; and I do hereby declare the following to be a full, clear, and exact description ot'theinvention, such as will enable others,

skilled in the art to which it appertains to make and use the same.-

My invention relates to certain new and-useful improvements in knob attachments, and has for its object to provide a device of this descri ption which shall be easy of attachment and simple to manufacture; and with theseends in View my invention consists in the details of construction hereinafter fully explained, and then specifically designated by the claims.

In order that those skilled in the art to which my invention appertains may fully understand its construction and operation, I will describe the same in detail, referring by letter to the accompanying drawings,for1ning apart of this specification, in whicl 1 Figure 1 is an end view of the latchhub; Fig. 2, a central longitudinal section of the hub with one of the knob-shanks therein in elevation, but partially broken away; Fig. 3,

an end View of the shank; Fig. 4, a side elevation of the shank; and Fig. 5 a vertical section through a lock provided with independent latch-hubs, in one of which a knobshank is shown as secured.

Similar letters denote like parts in all the figures of the drawings.

I A is the latch-hub, having a circular opening extending therethrough, except that at each end of said opening two lugs, B, opposite to one another, extend inwardly from the edges of the hub.

C is the knob-shank, grooved at D, so as to form the head E upon its end. The grooveD is slightly wider than the thickness of the lugs B, for the purpose presently to .be explained.

The head of the knobshank has cut in its periphery, opposite one to the other and extending longitudinal and the whole length of said head, two channels, F, corresponding in shape to but slightly larger than the lugs B on the hub. The head has also two recesses, G, formed therein at its inner face opposite to one another, and alternating with the channels F. These recesses are adapted in size and form to readily contain the lugs B.

(ModeL) To attach the knobs to the hub, the channels in the head of the shank are placedin coincidence with the lugs on the hub, and the head of the shank pushed inward till it has passed the said lugs and the latter rest in the groove D. The shank is then given a partial turn, which is rendered possible by the width of the groove in which the lugs rest, and the shank withdrawn outward and the lugs enter the recesses G. The knob belonging to the other end of the hub is then inserted in the manner just described. The latch-hub may then be readily turned by the knob to operate the latch. In this engagement the head of the knob-shank will be retained by the close fitting of the parts; but I can, if desired, use in connection with a hub and knob-shanks of this construction either of several devices for securing the shank against displacement-as, for instance, one of those shown in my Patents Nos. 330,188 and 330,189, granted to me November 10, 1885.

In Fig.5 I have shown independent latchhnbs, with which the heads may engage; but the construction in that figure is in nowise different from that shown in the preceding figures, except that the latch-hub is divided at its center,so that the two portions may rotate independent one of the other.

I find that an attachment made as herein shown and described is exceedingly advantageous, since the latch-hub is Very simple in construction and the knobshank readily formed by casting, thus greatly facilitating manufacture.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The combination, with a latch-hub having a central opening therethrough and inwardly-projecting lugs at either end thereof, of a headed knob-shank provided with channels longitudinal of its head and corresponding in position to said lugs, and recesses alternating with the channels formed in the inner end of the head of the knob-shank andadapted to receive the lugs upon the latch-hub, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

WILLISTON I. ALVORD' 

